Best instrumental prog albums you've ever heard

Tako (English: "That") was a Serbian progressive rock band that released their second and final album, "U vreći za spavanje" (English: "In the Sleeping Bag"), on the PGP label in 1980. It certainly was an ambitious project with careful composing and all-instrumental labour. While Pink Floyd, Camel, and other artists from the 1970s may be heard as influences, the album also showcases an early example of the neo-prog sound. A lot of soaring synthesisers and intricate guitar work give the songs a range of speeds, from slow, flute-accented dreamy passages to fast-paced and spacey progressive rock. 

There are two splendid reissues of "U vreći za spavanje" from the Brazilian label Rock Symphony, which has reissued many forgotten gems like this.

They have one self-titled album, and it's some of the most amazing prog metal jazz fusion (with actual jazz influences, as opposed to this "jazzy" thing that some metal groups dip their toe in, and fans yell "it's like JAZZ!"). And, as an Israeli band, the Middle Eastern/Eastern Mediterranean stylings are very apparent. They have one track with lyrics in Hebrew (with a guest singer), and another track has wordless vocals, but everything else on it is instrumental.

Agreed! Isobar are a fine instrumental band indeed. Listen to them at: https://isobarprog.bandcamp.com/.

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To mention a few:

Camel - The Snow Goose

Oaksenham - Upon All the Living and the Dead (2 songs with some vocals, but nevertheless I should mention this one)¹

Dean Watson - Track of Days

Deluge Grander - Oceanarium

In the PE niche:

Tangerine Dream - Ricochet, Stratosfear, Rubycon

Jean-Michel Jarre- Oxygène

¹ There have been more than a few superb instrumental albums in the second half of the 2010's.